1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 #include <sys/epoll.h>
31 static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
32 [DEVICE_DEAD] = UNIT_INACTIVE,
33 [DEVICE_AVAILABLE] = UNIT_ACTIVE
36 static const char* const state_string_table[_DEVICE_STATE_MAX] = {
37 [DEVICE_DEAD] = "dead",
38 [DEVICE_AVAILABLE] = "available"
41 static void device_done(Unit *u) {
42 Device *d = DEVICE(u);
48 static void device_set_state(Device *d, DeviceState state) {
49 DeviceState old_state;
55 log_debug("%s changed %s → %s", unit_id(UNIT(d)), state_string_table[old_state], state_string_table[state]);
57 unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
60 static int device_coldplug(Unit *u) {
61 Device *d = DEVICE(u);
64 assert(d->state == DEVICE_DEAD);
67 device_set_state(d, DEVICE_AVAILABLE);
72 static void device_dump(Unit *u, FILE *f, const char *prefix) {
73 Device *d = DEVICE(u);
78 "%sDevice State: %s\n"
80 prefix, state_string_table[d->state],
81 prefix, strna(d->sysfs));
84 static UnitActiveState device_active_state(Unit *u) {
87 return state_translation_table[DEVICE(u)->state];
90 static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) {
98 if (!(e = unit_name_escape_path(dn+1, ".device")))
101 r = unit_add_name(u, e);
103 if (r >= 0 && make_id)
104 unit_choose_id(u, e);
108 if (r < 0 && r != -EEXIST)
114 static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
115 const char *dn, *names, *wants, *sysfs;
121 struct udev_list_entry *item = NULL, *first = NULL;
125 /* Check whether this entry is even relevant for us. */
126 dn = udev_device_get_devnode(dev);
127 names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
128 wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
130 if (!dn && !names && !wants)
133 /* Ok, seems kinda interesting. Now, let's see if this one
136 if (!(sysfs = udev_device_get_syspath(dev)))
139 assert(sysfs[0] == '/');
140 if (!(e = unit_name_escape_path(sysfs+1, ".device")))
143 if (!(u = manager_get_unit(m, e))) {
148 if (!(u = unit_new(m))) {
153 r = unit_add_name(u, e);
159 if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
164 if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
165 (model = udev_device_get_property_value(dev, "ID_MODEL"))) {
166 if ((r = unit_set_description(u, model)) < 0)
169 if ((r = unit_set_description(u, dn)) < 0)
172 unit_add_to_load_queue(u);
179 if ((r = device_add_escaped_name(u, dn, true)) < 0)
182 first = udev_device_get_devlinks_list_entry(dev);
183 udev_list_entry_foreach(item, first)
184 if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
188 FOREACH_WORD(w, l, names, state) {
189 if (!(e = strndup(w, l))) {
194 r = unit_add_name(u, e);
197 if (r < 0 && r != -EEXIST)
203 FOREACH_WORD(w, l, wants, state) {
204 if (!(e = strndup(w, l))) {
209 r = unit_add_dependency_by_name(u, UNIT_WANTS, e);
218 manager_dispatch_load_queue(u->meta.manager);
219 device_set_state(DEVICE(u), DEVICE_AVAILABLE);
222 unit_add_to_dbus_queue(u);
232 static int device_process_path(Manager *m, const char *path, bool update_state) {
234 struct udev_device *dev;
239 if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
240 log_warning("Failed to get udev device object from udev for path %s.", path);
244 r = device_process_new_device(m, dev, update_state);
245 udev_device_unref(dev);
249 static int device_process_removed_device(Manager *m, struct udev_device *dev) {
258 if (!(sysfs = udev_device_get_syspath(dev)))
261 assert(sysfs[0] == '/');
262 if (!(e = unit_name_escape_path(sysfs+1, ".device")))
265 u = manager_get_unit(m, e);
275 device_set_state(d, DEVICE_DEAD);
279 static void device_shutdown(Manager *m) {
283 udev_monitor_unref(m->udev_monitor);
289 static int device_enumerate(Manager *m) {
290 struct epoll_event ev;
292 struct udev_enumerate *e = NULL;
293 struct udev_list_entry *item = NULL, *first = NULL;
297 if (!(m->udev = udev_new()))
300 if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
305 if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
310 m->udev_watch.type = WATCH_UDEV;
311 m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
315 ev.data.ptr = &m->udev_watch;
317 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
320 if (!(e = udev_enumerate_new(m->udev))) {
325 if (udev_enumerate_scan_devices(e) < 0) {
330 first = udev_enumerate_get_list_entry(e);
331 udev_list_entry_foreach(item, first)
332 device_process_path(m, udev_list_entry_get_name(item), false);
334 udev_enumerate_unref(e);
339 udev_enumerate_unref(e);
345 void device_fd_event(Manager *m, int events) {
346 struct udev_device *dev;
351 assert(events == EPOLLIN);
353 if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
354 log_error("Failed to receive device.");
358 if (!(action = udev_device_get_action(dev))) {
359 log_error("Failed to get udev action string.");
363 if (streq(action, "remove")) {
364 if ((r = device_process_removed_device(m, dev)) < 0) {
365 log_error("Failed to process udev device event: %s", strerror(-r));
369 if ((r = device_process_new_device(m, dev, true)) < 0) {
370 log_error("Failed to process udev device event: %s", strerror(-r));
376 udev_device_unref(dev);
379 const UnitVTable device_vtable = {
382 .init = unit_load_fragment_and_dropin_optional,
384 .coldplug = device_coldplug,
388 .active_state = device_active_state,
390 .enumerate = device_enumerate,
391 .shutdown = device_shutdown